I just got 10 LBS of LR from the LFS. It looked like decent quality rock. I have had it in my tank for about 3 days. Today I noticed a gray pattern growing on one of the rocks. It looks as if someone painted it on to the rock. It is gray with darker gray lines making a pattern. I'm kind of confused as to what it is. Any help please?

Also...on of the rocks there is this small (1-2 inch), brown thing with jelly like spikes floating about. If I could get some info on that as well please.

I have a Canon G2 Powershot 4.0 Megapixel digital camera but I can't seem to get a good picture of anything inside my tank. I could use some help. I don't think there is anything wrong with the camera I'm using so it must be my technique.

Wow. I heard people saying "use a tripod" and I was like, yeah right, that's going to do much. Well I tried it and my pictures got 100% clearer. Ok here's what I got (the last one is of the weird jelly spikey thingy):

I think you might be right. What exactly is it though? I mean what class of creatures would it go in. I'm kind of worried about it because I don't have very good lighting and I don't want it to die off. I am assuming it either has very strong senses or it has eyes because when I bring the net near it, it goes into its hole on the live rock. Completely hidden.